Antiperovskite Intermetallic Nanoparticles for Enhanced Oxygen Reduction

Antiperovskite Co₃InC_0.7N_0.3 nanomaterials with highly enhanced oxygen reduction reaction (ORR) performance were prepared by tuning nitrogen contents through a metal–organic framework (MOF)‐derived strategy. The nanomaterial surpasses all reported noble‐metal‐free antiperovskites and even most perovskites in terms of onset potential (0.957 V at J=0.1 mA cm^?2) and half‐wave potential (0.854 V). The OER and zinc–air battery performance demonstrate its multifunctional oxygen catalytic activities. DFT calculation was performed and for the first time, a 4 e^? dissociative ORR pathway on (200) facets of antiperovskite was revealed. Free energy studies showed that nitrogen substitution could strengthen the OH desorption as well as hydrogenation that accounts for the enhanced ORR performance. This work expands the scope for material design via tailoring the nitrogen contents for optimal reaction free energy and hence performance of the antiperovskite system.     

掺杂Tb3+的混合碱土金属钨酸盐的合成和性质

合成了掺杂Ｔｂ（３＋）的混合碱土金属钨酸盐，测定了其发射光谱和激发光谱，用粉末Ｘ射线衍射和电子衍射法表征了其晶体结构，并对钨酸钙钡单晶体进行了Ｘ射线能谱成份分析．探讨了碱土金属钨酸盐的溶混性成因以及在这些晶体中Ｔｂ（３＋）发光和能量传递机理．     

二氰基二硫纶和邻菲罗啉二酮的镍(Ⅱ)、铜(Ⅱ)、锌(Ⅱ)配合物的合成与性质

二氰基二硫纶和邻菲罗啉二酮的镍（Ⅱ）、铜（Ⅱ）、锌（Ⅱ）配合物的合成与性质彭正合＊潘庆才ａ任小明ｂ张克立秦子斌（武汉大学化学系，武汉４３００７２；ａ南京大学配位化学国家重点实验室，南京２１００９３）关键词：二硫纶邻菲罗啉二酮镍铜锌二硫纶（ｄｉｔｈｉｏ...     

四价铈卟啉配合物的合成和性质研究

由于镧系卟啉配合物具有优于d过渡金属卟啉配合物的特殊光学和磁学性能,因而越来越引起人们的浓厚兴趣。但是,十多年来,这方面的研究工作主要集中在三价稀土卟啉配合物上,还未见到四价稀土卟啉配合物的报道。我们合成了铈(Ⅳ)的卟啉配合物,并研究了它们的光谱性质。     

Formation of a cyclic dimer containing two mirror image monomers in the solid state controlled by van der Waals forces

Two new copillar[5]arenes were prepared. They are arranged in two completely different motifs, a cyclic dimer containing two monomers with two different conformations that are mirror images of each other and linear supramolecular polymers in the solid state. Not only has it been shown that to form this kind of dimer is a unique feature associated with pillar[5]arene macrocycles but also it was demonstrated that weak van der Waals forces can be used to control the self-organization of monomers during their supramolecular polymerization process.     

二氰基二硫纶·二甲基联吡啶镉(Ⅱ)配合物的合成与谱学特性的研究

以氰化钠、二硫化碳、二甲基联吡啶及氯化镉为起始原料,合成了一种功能性新型二氰基二硫纶·二甲基联吡啶合镉（ Ⅱ） 配合物Ｃｄ（ｍｎｔ）（ｄｍｂｐ）（ｍｎｔ＝ １,２＿ｄｉｃｙａｎｏ＿１ ,２＿ｅｔｈｙｌｅｎｅｄｉｔｈｉｏｌａｔｅ,ｄｍｂｐ＝ ４ ,４′＿ｄｉｍｅｔｈｙｌ＿２ ,２′＿ｂｉｐｙｒｉｄｉｎｅ） 。经元素分析、热谱、摩尔电导、红外光谱、电子吸收光谱和发射光谱表征,其结构为四配位的电中性配合物。热分解温度高于３０５ ℃。在ＤＭＦ、ＤＭＳＯ中溶解度较好;在ＴＨＦ、Ｐｙ、丙酮中次之;在氯仿、乙醇、甲醇中溶解度较差,几乎不溶于水、乙醚、苯中     

Formation of a Copillar[5]arene‐Based Supramolecular Polymer in Solution and in the Solid State

A linear supramolecular polymer based on the self‐assembly of an easily available copillar[5]arene monomer is efficiently prepared, which is evidenced by the NMR spectroscopy, viscosity measurement, and DOSY experiment. The single‐crystal X‐ray analysis reveals that the polymerization of the AB‐type monomer is driven by the quadruple CH•••π interactions and one CH•••O interaction.

     

Experimental investigation of light storage of diffraction-free and quasi-diffraction-free beams in hot atomic gas cell

In this article we report on the experimental investigation of light storage for several types of diffractionfree beams (Bessel and Airy beams) and quasi-diffraction-free beams by utilizing electromagnetically induced transparency (EIT) technique in a hot atomic gas cell. The experimental results show that the diffraction-free and quasi-diffraction-free beams have better storage performances when compared with ordinary images possessing similar spatial profiles. Meanwhile, the Bessel beams and the quasidiffraction-free images are able to maintain their spatial profiles with a long storage time while the sidelobes of the Airy beam are gradually depleted with the increment of the storage time. We quantitatively analyze the storage results and give physical explanations behind these phenomena. Furthermore, the self-healing of the retrieved diffraction-free beams is verified, signifying that their characteristics preserve well after storage.